Low carbohydrate diets have spread across the world, promising quick weight loss. And they have delivered enough to make them the most popular diets of all time.

Still, many dieters, even the hard core ones, are left wondering if the diet could be bad for them.

So far, the evidence isn't clear to say that thediets are for sure safe or dangerous. But many doctors do worry about increased cholesterol with the high fat, kidney problems with the high protein, and metabolic problems with the constant up and down of the weight.

So, is this just another fad diet or are low carbs the new normal diet?

The bottom line is, if you think it is bad for you, there's a good chance it is.

Many of the diets require crucial supplements to fend off health problems later on.

As always, make sure to talk to your doctor before starting any new diet.